CN209332172U - A pneumatic blood pumping device - Google Patents

Abstract

The utility model relates to a pneumatic blood drawing device. The pneumatic blood drawing device includes a cuff, a main control unit, an inflating unit connected to the main control unit, a deflation unit and a timing unit; the air outlet component of the inflating unit passes through a The trachea is connected to the cuff; the deflation unit is connected to the air outlet component of the inflation unit; the inflation unit is used to inflate the cuff through the trachea according to a default pressure value in the cuff; The timing unit is used to time the scheduled blood collection time. When the scheduled blood collection time arrives, the main control unit controls the inflating unit to stop running and the deflation unit to open to release the air in the cuff. The device of the utility model can reduce labor intensity, save time and effort, and completely solve the limb damage caused by the blood-drawing belt being left on the patient, causing the blood-drawing belt to compress the wrist or arm for a long time, causing local ischemia, and is safe and reliable.

Description

A pneumatic blood pumping device

【Technical field】

The utility model relates to the technical field of medical instruments, in particular to a pneumatic blood drawing device for blood drawing.

【Background technique】

In a hospital or clinic, blood is usually drawn by performing a venipuncture or phlebotomy on a patient's extremity. In order for a venipuncture to be performed, the vein must first be filled with blood by preventing the return of blood from the vein while allowing the artery to flow in. Currently it is usually performed using a blood draw banded upstream of the extremity venipuncture site, as shown in Figure 1. The blood-drawing band 1 is generally a rubber tube or a flat rubber band, which may cause the patient to be too tight during banding, causing discomfort, and the arterial blood flow will also be blocked, and if the blood-drawing band is left on the patient, it will be tied for a long time. On the patient's limb, the patient's limb may suffer limb damage due to ischemia.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the above-mentioned technologies and provide a pneumatic blood pumping device.

The first aspect of the utility model provides a pneumatic blood pumping device, including a cuff, and also includes a main control unit, an inflation unit connected to the main control unit, a deflation unit, and a timing unit; the air outlet part of the inflation unit passes through a trachea connected with the cuff; the deflation unit is connected with the air outlet part of the inflation unit; the inflation unit is used to inflate the cuff through the air tube according to the default pressure value in the cuff; the The timing unit is used to time the predetermined blood collection time, and when the predetermined blood collection time arrives, the main control unit controls the inflation unit to stop running and the air release unit to open to release the air in the cuff.

Further, an alarm unit connected to the main control unit is also included, and is used to issue an alarm to the remaining blood collection time.

Further, the alarm unit is a buzzer and/or a warning light, the buzzer is used to emit sounds of different frequencies to warn of the remaining blood collection time, and the warning light is used to emit different light warnings to warn of the remaining blood collection time.

Further, it also includes an air pressure detection unit for detecting the pressure value in the trachea; the air pressure detection unit is respectively connected with the main control unit and the air outlet part of the inflatable unit.

Further, the air pressure detection unit is an air pressure sensor.

Further, it also includes a display unit connected to the main control unit, for displaying relevant information of the blood collection process.

Further, the display unit includes a display screen and/or a pressure indicator light.

Further, a manual control unit is also included, and the manual control unit is connected with the main control unit for manually controlling the device.

Further, the manual control unit includes a pressure selector and a switch button; the pressure selector is used to select a preset pressure value, and the switch button is used to start and/or stop the device.

Further, the cuff is provided with an air inlet, and the air tube is detachably connected to the air inlet.

The second aspect of the utility model provides a method for using a pneumatic blood pumping device, including the following steps:

attach the cuff to the limb;

The operation of the inflatable unit is controlled by the main control unit, and the inflatable unit inflates the cuff through the trachea according to a default pressure value, represented by P;

The air release unit is controlled to close by the main control unit;

After the inflation unit is running and the deflation unit is closed, the timing unit is controlled by the main control unit to start, and the scheduled blood collection time is timed;

When the predetermined blood collection time arrives, the main control unit controls the inflation unit to stop running, and the air release unit to open to release the air in the cuff.

Further, the following step is also included: after the timing unit is started, the main control unit is used to control the start of the alarm unit, and the alarm unit issues a warning to the remaining blood collection time.

Further, the alarm unit is a buzzer and/or a warning light, the buzzer emits sounds of different frequencies to warn of the remaining blood collection time, and the warning light emits different light warnings to warn of the remaining blood collection time.

The pneumatic blood pumping device of the utility model inflates air into the cuff through the inflatable unit, so that the cuff is pressed against the patient's limbs, thereby performing blood collection, which saves time and effort, and at the same time, the air in the cuff can be automatically released through the timing unit and the deflation unit. , It also completely solves the limb injury caused by the blood draw belt left on the patient's body, which causes the blood draw belt to oppress the wrist or arm for a long time, resulting in ischemia, and realizes intelligent decompression, which is safe and reliable.

【Description of drawings】

Fig. 1 is a structural schematic diagram of a prior art blood drawing belt bandaged upstream of a limb venipuncture site;

Fig. 2 is a schematic structural view of a pneumatic blood drawing device of the present invention;

Fig. 3 is a functional block diagram of the pneumatic blood drawing device shown in Fig. 2;

Fig. 4 is a schematic diagram of the relationship between diastolic pressure and heartbeat.

【Detailed ways】

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Embodiment one

Referring to Fig. 2 and Fig. 3, a kind of pneumatic blood drawing device provided by the utility model is used as an auxiliary tool for blood drawing, and includes a cuff 10, a main control unit 11, an inflation unit 12 connected with the main control unit 11, and a timing unit 13 And leak unit 14.

In this embodiment, the size of the cuff 10 is 8*43 cm, suitable for wrists and arms, and used to be tied upstream of the venipuncture site. The specific size of the cuff 10 does not constitute a limitation of the present invention. The front and back of the two ends of the cuff 10 are connected by Velcro or Velcro for easy tying. In other embodiments, the connection method of the cuff can also be other feasible connection methods. For example, the cuff 10 can also be a ring sleeve, which can be directly placed on the wrist or arm, so the specific connection method of the cuff does not constitute Limitations of the Invention.

The inflatable unit 12 is provided with an air outlet component, preferably, the air outlet component is an air outlet pipe 121 . In other embodiments, the air outlet component may also be an air outlet. In this embodiment, the air outlet pipe 121 is connected to the cuff 10 through a trachea 15. Specifically, an air storage space (not shown here) is provided inside the cuff 10, and a gas storage space communicating with the air storage space is provided on the cuff 10. The air inlet 101 of the air tube 15 is detachably connected with the air inlet 101, such as through threaded connection, sleeve connection, etc., so the cuff 10 can be used repeatedly, and can also be a disposable item. The inflatable unit 12 is used to inflate the cuff 10 through the trachea 15 according to the default pressure value in the cuff 10, so that the air pressure in the air storage space in the cuff 10 is increased to compress the wrist or arm, so that blood can be collected without medical attention It saves time and labor for the personnel to bandage the wrist or arm. In this embodiment, the inflation unit 12 is an air pump. The inflation frequency of the inflation unit 12 can be constant, or can be divided into multiple stages according to the instructions of the main control unit 11, such as two-stage, three-stage and so on.

The main control unit 11 is a microprocessor, and the microprocessor mainly controls other components of the device by sending different PWMs (Pulse Width Modulation, pulse width modulation), such as controlling the operation and stop of the inflation unit 12, opening and closing of the deflation unit 14. Close action.

The deflation unit 14 is connected to the gas outlet pipe 121 of the inflation unit 12. The deflation unit 14 may be, for example, one or a group of solenoid valves. In this embodiment, the deflation unit is a solenoid valve. The specific type and number of solenoid valves do not constitute a limitation of the present utility model.

The timing unit 13 is used to time the predetermined blood collection time, and the timing unit 13 may be, for example, a timer or a group of timers. The specific model, brand and number of the timer do not constitute a limitation of the present utility model. When the predetermined blood collection time arrives, the main control unit 11 controls the inflation unit 12 to stop running, and the air release unit 14 to open to release the air in the cuff 10 . According to clinical tests, the time for blood collection by venipuncture is generally completed within 3 minutes. In this embodiment, the predetermined time for blood collection is generally 3 minutes, and the timing unit 13 counts the time for blood collection for 3 minutes. If the blood drawing fails to be completed within 3 minutes, the start/reset time unit 13 can be pressed before the end time to obtain another 3 minutes. When the time of 3 minutes arrives, the main control unit 11 controls the inflation unit 12 to stop running, and the deflation unit 14 is opened to release the air in the cuff 10, so that the cuff 10 no longer compresses the wrist or arm, which can prevent the cuff 10 from being too long. Time pressure on the wrist or arm causes limb damage caused by local ischemia, and realizes intelligent decompression. After the air in the cuff 10 is released, the cuff 10 can be detached from the wrist or arm. The specific blood collection time will be adjusted according to actual medical needs, and does not constitute a limitation of the present invention. The timing mode can also be changed according to the change of the air pressure value in the cuff 10 . For example, when the air pressure in the cuff 10 is higher than 5mmHg, the timing unit 13 starts to run until a predetermined time; or when the air pressure in the cuff 10 is lower than 5mmHg, the timing unit 13 stops working. This is because when the air pressure in the cuff is less than 5mmHg, the pressure of the cuff cannot effectively compress the patient's limbs, so there is no need for timing.

In order to remind medical personnel or patients of the remaining blood collection time, preferably, the utility model is provided with an alarm unit 16 connected to the main control unit 11 for warning the current remaining blood collection time. The remaining blood sampling time is the remaining time from when the main control unit 11 controls the inflatable unit 12 to stop running and the air release unit 14 to open to release the air in the cuff 10 . The alarm unit 16 can alert medical personnel or patients by hearing, for example, the alarm unit 16 can be a buzzer 161, which is used to emit sounds of different frequencies to warn of the remaining time. For example, the timing unit 13 sets a blood collection time of 3 minutes. After the timing unit 13 is started, the buzzer 161 indicates the length of the remaining time with different sound combinations: when the remaining time is more than 1 minute, the buzzer 161 sounds every two minutes Sound once per second; when the remaining time is more than 30 seconds but less than 60 seconds, the buzzer 161 sounds once per second; when the remaining time is less than 30 seconds, the buzzer 161 sounds twice per second It emits a sound at a certain frequency, which serves as an auditory reminder to medical staff. The specific sound frequency combination does not constitute a limitation of the present invention, for example, it may be a combination of two different sound frequencies. The alarm unit 16 can also remind medical staff or patients visually. For example, the alarm unit 16 can be a warning light 162, which is used to issue different light warnings to warn of the remaining time. For example, the timing unit 13 sets a blood collection time of 3 minutes. After the timing unit 13 is started, when the remaining time is more than 1 minute, the warning light 162 emits light at a frequency of once every two seconds; when the remaining time is more than 30 seconds but less than 60 seconds Seconds, the warning lamp 162 emits light once per second; when the remaining time is less than 30 seconds, the warning lamp 162 emits light twice per second, thereby visually reminding the medical staff. Of course, in order to better warn the medical staff, multiple warning methods can be adopted at the same time, such as using both auditory and visual reminders of the remaining blood collection time, for example, the alarm unit 16 can be a combination of a buzzer 161 and a warning light 162 , to further strengthen the warning function.

Preferably, the present utility model may further include a display unit 19 connected to the main control unit 11 . In this embodiment, the display unit 19 is an LCD display screen, which is used to display information about the blood collection process or device, such as the current blood collection time, the selected pressure level, the current pressure value in the trachea 15, the current diastolic pressure, etc. The specific displayed content can be adjusted according to user needs, so the specific displayed content does not constitute a limitation of the present invention. More preferably, the device of the present utility model can also be provided with a pressure indicator light 163 to indicate the current pressure value of the cuff 10 with different pressure indicator lights 163, so that the medical personnel do not need to constantly check the LCD unit 19 to understand the current pressure value of the cuff 10 suitable for the patient. For example, the preset pressure values are 70mmHg, 80mmHg and 90mmHg, and the three pressure indicator lights 163 are correspondingly set to correspond to different pressure values. When different pressure indicator lights 163 light up, it means that the current cuff 10 adopts the corresponding preset pressure. value. The number of specific pressure indicator lights 163 does not constitute a limitation of the present invention. For example, the preset pressure values in the cuff 10 are only divided into low pressure and high pressure, so only two pressure indicator lights 163 are needed.

Preferably, the present utility model may also include a manual control unit, specifically a pressure selector 20 , a start/restart control button 21 and a stop button 22 in this embodiment. The pressure selector 20 is used to select a suitable preset pressure value in the cuff 10 , and there may be multiple preset pressure values in the cuff 10 . In this embodiment, the preset pressure values in the cuff 10 are three, specifically 70mmHg, 80mmHg and 90mmHg. The number and value of the specific preset pressure values do not constitute a limitation of the present invention. After selecting a preset pressure value, the main control unit 11 can control the inflation unit 12 to inflate the cuff 10 through the air tube 15 according to the default pressure value. The start/restart control button 21 is used for start/restart, that is, when the start/restart control button 21 is pressed, the device of the present utility model starts to work; When, can press start/restart control button 21 to reset the time of timing blood collection. If the blood drawing is completed ahead of the blood collection time set by the timing unit 13, the stop button 22 can also be selected to be pressed, the main control unit 11 controls the inflation unit 12 to stop inflation, and the deflation unit 14 deflates to release the air in the cuff 10.

The utility model can also include a power supply unit 23 . This embodiment adopts a standard USB 5V power supply, which is a rechargeable power supply. The specific power supply mode does not constitute a limitation of the present invention.

The utility model inflates the cuff through the inflatable unit, so that the cuff is pressed against the patient's limbs, thereby saving time and effort for blood collection. At the same time, the air in the cuff can be automatically released through the timing unit and the deflating unit, which can completely solve the problem of bleeding. The blood band is left on the patient's body, causing the blood band to oppress the wrist or arm for a long time, resulting in limb injury caused by local ischemia, realizing intelligent decompression, safe and reliable.

Embodiment two

This embodiment is based on the first embodiment, and the same or similar parts as the first embodiment will not be described again. The utility model can also include an air pressure detection unit 18, which is connected with the air outlet pipe 121 of the main control unit 11 and the inflatable unit 12, and is used to detect the pressure value in the air pipe 15, so that the main control unit 11 can compare the pressure value and the pressure value in the air pipe 15. The preset pressure value is compared and the air charging unit 12 is controlled to operate with a corresponding duty cycle (Duty Cycle) according to the comparison result. Since the inflatable unit 12 may leak air when it is stationary or rotates at a slow speed, the inflatable unit 12 needs to maintain an appropriate rotational speed to fix the pressure in the air pipe 15 at a certain air pressure. For example, if the pressure value in the trachea 15 is higher than the preset pressure value of 5mmHg, the air charging unit 12 operates at a duty cycle of 5% to 15%, preferably at a duty cycle of 10% (although in theory, the air charging unit No need to inflate, but in order to make the user feel comfortable, such as not feeling the sudden change of air pressure on the arm, the inflatable unit 12 will run at the slowest 10% duty cycle); if the pressure value in the trachea is higher than The preset pressure value is not higher than 5mmHg at the same time. Since the higher air pressure is not much, the inflatable unit operates at a duty cycle of 30% to 50%, preferably at a duty cycle of 40%; if the pressure value in the trachea Below the preset pressure value, and at the same time not lower than 5mmHg, due to the smaller difference from the preset pressure value, the inflatable unit operates at a faster 45% to 65% duty cycle, preferably 55% duty cycle Otherwise, due to the large difference from the preset pressure value, the inflatable unit operates at the highest speed of 100% duty cycle. Running with a segmented duty cycle, the user will not feel obvious discomfort when using it, which is conducive to the smooth progress of the blood collection process. The above list is only a preferred embodiment of the utility model, and the specific number of segments and the operating ratio of the duty cycle do not constitute a limitation of the utility model. Since one end of the trachea 15 is connected to the cuff 10 , and the pressure loss from the outlet tube 121 to the inlet 101 is almost negligible, the pressure of the trachea 15 can also be regarded as the pressure inside the cuff 10 . At the same time, the arrangement of the air pressure detection unit 18 does not need to change the structure of the cuff 10, thereby facilitating the replacement of the cuff 10. In this embodiment, the air pressure detection unit 18 is an air pressure sensor.

The diastolic blood pressure of normal human body is 60-90mmHg. Preferably, the preset pressure value is the patient's diastolic pressure and should be greater than 50 mmHg. An appropriate default pressure value can reduce the user's possible discomfort during blood collection. In this embodiment, the detection of the diastolic blood pressure utilizes the air pressure detection unit 18, that is, the air pressure sensor, passes through the low pass filter (Low Pass Filter) 24 and then uses the moving average (Moving Average) to filter the noise and then combine the oscillometric method (Oscillometric method) ) or FFT (Fast Fourier Transformation, Fast Fourier Transformation) analysis. Here, the oscillometric amplitude method is used as an example for illustration. The air pump inflates the cuff, and exhausts it slowly after reaching a certain pressure value. During the deflation process, the pressure sensor converts the pressure signal in the cuff into an electrical signal and sends it to the main control unit 11 for filtering and algorithm calculation. Refer to Figure 4 for the relationship between diastolic blood pressure and heartbeat. The time-pressure diagram shown at the top of Figure 4, the cuff pressure is 70-130mmHg, does not mean that the cuff pressure can extend upwards or downwards indefinitely, it is only used to indicate that the cuff 10 will have pressure changes during the exhaust process . Set the initial preset pressure value to 100mmHg. If the air pressure detection unit 18 detects a pulse oscillation, the main control unit 11 adjusts the default pressure value, for example, by 5 mmHg. The adjustment range of the default pressure value does not constitute a limitation of the present invention. The above detection process is repeated until the air pressure detection unit 18 detects no pulse oscillation. At this time, the pressure in the cuff is the patient's diastolic blood pressure. The main control unit 11 can use the detected diastolic pressure as a preset pressure value, and the blood drawing belt will complete the whole blood drawing process under the pressure value of the diastolic pressure, so as to better complete the blood drawing process.

Embodiment three

The utility model also provides a method for using the pneumatic blood pumping device, which includes the following steps:

S101: tie the cuff 10 on the limb;

The extremity can be anywhere that requires venipuncture, such as the wrist or arm;

S102: Control the operation of the inflation unit 12 through the main control unit 11, and the inflation unit 12 inflates the cuff 10 through the air tube 15 according to the default pressure value;

After the inflatable unit 12 is in operation, the pressure in the cuff 10 gradually increases, thereby compressing the limbs to facilitate blood collection;

S103: Control the air leakage unit 14 to close through the main control unit 11;

The steps of S102 and S103 are in no particular order, and can also be performed at the same time. When the air leakage unit 14 is closed, the gas can basically only enter and exit, so that the pressure required for blood collection can be reached in a relatively short period of time;

S104: After the inflation unit 12 is running and the deflation unit 14 is closed, the main control unit 11 controls the timing unit 13 to start, and counts the scheduled blood collection time;

S105: When the scheduled blood collection time arrives, the main control unit 11 controls the inflation unit 12 to stop running, and the air release unit 14 to open to release the air in the cuff 10 .

The use method of the utility model can effectively reduce the labor intensity of medical personnel, save time and effort, and completely solve the limb injury caused by the blood-drawing belt left on the patient's body, which causes the blood-drawing belt to press the wrist or arm for a long time to cause local ischemia , to achieve intelligent decompression, safe and reliable.

Embodiment four

This embodiment is based on the third embodiment, and the same or similar parts as the third embodiment will not be described again. This embodiment may further include the following steps: after the timing unit 13 is started, the main control unit 11 controls the alarm unit 16 to start, and the alarm unit 16 issues a warning to the remaining blood collection time. Specifically, the alarm unit 16 is a buzzer 161, and the buzzer 161 emits sounds of different frequencies to warn of the remaining time for blood collection, and plays an auditory warning role for medical personnel. The alarm unit 16 can also be a warning light 162, which emits different lights or frequency warnings to warn of the remaining blood collection time, and serves as a visual warning to medical personnel. Of course, the alarm unit 16 can also be a buzzer 161 and a warning light 162 at the same time, which can respectively play an auditory and visual alarm function for the medical personnel and strengthen the alarm function. In this embodiment, there is only one warning light 162 , which can respectively emit lights of different frequencies for warning.

Preferably, this embodiment may further include the following steps: after the inflation unit 12 is operated and the deflation unit 14 is closed, the air pressure detection unit 18 detects the pressure value in the air pipe 15, and the main control unit 11 will detect the pressure value in the air pipe 15 It is compared with the preset pressure value, and according to the comparison result, the air charging unit 12 is controlled to operate at a corresponding duty cycle to keep the pressure in the air pipe 15 constant. Specifically, if the detected pressure value in the trachea is higher than the preset pressure value of 5mmHg, the inflatable unit operates at a duty cycle of 5% to 15%, preferably at a duty cycle of 10%; if the detected pressure in the trachea value is higher than the preset pressure value and not higher than 5mmHg at the same time, the inflatable unit operates at a duty cycle of 30% to 50%, preferably at a duty cycle of 40%; if the detected pressure value in the trachea is lower than the preset Set the pressure value, and at the same time not lower than 5mmHg, the inflatable unit operates at a duty cycle of 45% to 65%, preferably at a duty cycle of 55%; otherwise, the inflatable unit operates at a duty cycle of 100%.

Preferably, the utility model may also include the following steps: after the inflation unit 12 is in operation and the deflation unit 14 is closed, the cuff pressure is detected by the air pressure detection unit 18, and combined with the main control unit 11 to calculate the diastolic pressure, and the diastolic pressure The value replaces the original preset pressure value. Specifically, when the inflation unit 12 inflates the cuff 10 to a certain pressure value, the cuff is deflated. If the air pressure detection unit 18 detects a pulse oscillation, the main control unit 11 adjusts the default pressure value, for example, by 5 mmHg. The above detection process is repeated until the air pressure detection unit 18 detects no pulse oscillation.

Preferably, the utility model can also include the following steps: after the cuff 10 is fastened on the limb, press the start button 21 to start, and the deflation unit 14 is closed; if the pressure selector 20 is pressed, the preset pressure value can be selected ; If the stop button 22 is pressed, the deflation unit is opened, the air in the cuff is released, and the blood collection process ends.

The above examples only express the preferred implementation of the present utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the patent scope of the present utility model. It should be noted that, for those skilled in the art, without departing from the concept of the present utility model, several modifications and improvements can be made, such as combining different features in the various embodiments, etc., all of which are Belong to the protection scope of the utility model.

Claims (9)

1. a kind of pneumatic bloodletting instrument, including cuff, it is characterised in that: further include main control unit, connect with main control unit Inflation unit, lose heart unit and timing unit；The outlet component of the inflation unit is connect by a tracheae with the cuff； The discouraged unit is connect with the outlet component of the inflation unit；The inflation unit is used for according to the pressure in the cuff of default Force value is inflated by the tracheae into the cuff；The timing unit is used to carry out timing to scheduled blood sampling time, when After scheduled blood sampling time reaches, the main control unit controls that the inflation unit is out of service, the discouraged unit is opened To discharge the air in the cuff；It further include the alarm unit being connect with the main control unit, for remaining blood sampling Time issues warning.

2. pneumatic bloodletting instrument according to claim 1, it is characterised in that: the alarm unit is buzzer and/or police Lamp is accused, the buzzer is used to issue the sound of different frequency to warn remaining blood sampling time, and the emergency warning lamp is for issuing Different light warns remaining blood sampling time.

3. pneumatic bloodletting instrument according to claim 1, it is characterised in that: further include air pressure detecting unit, for detecting The endotracheal pressure value；The air pressure detecting unit outlet portion with the main control unit, the inflation unit respectively Part connection.

4. pneumatic bloodletting instrument according to claim 3, it is characterised in that: the air pressure detecting unit includes air pressure sensing Device.

5. pneumatic bloodletting instrument according to claim 3, it is characterised in that: further include display unit, for showing blood sampling The relevant information of process；The display unit is connect with the main control unit.

6. pneumatic bloodletting instrument according to claim 5, it is characterised in that: the display unit include display screen and/or Pressure indicator light.

7. pneumatic bloodletting instrument according to claim 5, it is characterised in that: it further include manual control unit, it is described manual Control unit is connect with main control unit, is used for manual overvide.

8. pneumatic bloodletting instrument according to claim 7, it is characterised in that: the manual control unit includes pressure selection Device and switch button；The pressure selector is for selecting preset pressure value, and the switch button is for opening and/or stopping filling It sets.

9. pneumatic bloodletting instrument according to claim 8, it is characterised in that: the cuff is equipped with air inlet, the tracheae It is detachably connected with the air inlet.